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Rare earth barium copper oxide (REBCO) coated conductor has emerged as one ofthe high Tc superconductors suitable for future ultrahigh field superconductingmagnet applications. In the design and fabrication of such ultrahigh fieldREBCO magnets, it is essential to understand the behavior of REBCO coatedconductor. The effect of heating on the properties of commercial REBCO coatedconductors is very important for many practical reasons. Nevertheless, acomprehensive study on this effect have not yet been presented in the publishedliterature. This work studies a commercial REBCO coated conductor heat-treatedat temperatures between 175 {\deg}C and 300 {\deg}C for various durations.Critical current and lap joint resistivity were measured at 77 K and 4.2 K forthe heat-treated samples. We found that critical current degrades with heattreatment time and temperature. This degradation can be described by aone-dimensional oxygen out-diffusion model with a diffusion coefficient of D =2.5 x 10-6 exp (-1.17 eV/kT) m2/s. The heat treatment also causes appreciableincrease in joint resistivity. Comprehensive structural and chemical analyseswere performed on Cu/Ag/RECBO interfaces by transmission electron microscopy(TEM). Our electron energy loss spectroscopy (EELS) study provided directevidence of oxygen deficiency in the heat treated REBCO samples. In addition,it is found that the oxygen diffused out of the REBCO layer forms mostly Cu2Oat both Ag/REBCO and Cu/Ag interfaces. Cu2O is also observed at grainboundaries of the Ag layer. The oxygen out-diffusion model proposed in thiswork is used to predict REBCO thermal degradation in several engineeringscenarios.

Oxygen out-diffusion in REBCO coated conductor due to heating